Ship&#39;s davit



C. B. OSBON.

SHIPS DAVIT.

, APPLICATION FILED MAY 26.1920.

1,401,919} Patented Dec. 27, 1921,

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0. B. ossou; SHIPS DAVIT.

APPLICATION FILED MAY 26,1920, 1,401,919. ented De0.27, 1921.

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SH|PS DAVIT.

APPLICATION FILED MAY 26. I920.

Patented Dec.27,192 1.

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SHIPS DAVIT.

APPLICATION FILED MAY 26, I920.

Patented Dec.27,192 1.

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UNHTED STATES raiser CHARLES B. OSBON, OF SOMERVILLE, MASSACHUSETTS.

SHIPS DAVIT.

Application filed May 26,

T 0 all whom it may concern. 7

Be it known that CHARLES B. OsnoN, a

citizen of the United States, and resident launching of a boat on an even keel from a vessel in any kind of a sea, and likewis the hoistingof a boat to the deck of a vessel.

In the drawings of one embodiment of my invention illustrated and described herein:

Figure 1 is a plan, showing the boat swung outboard from the vessel side and ready to be lowered into the water or swung in ward and lowered on the chocks;

Fig. 2, a side elevation showing the boat just raised from its chocks.

Fig. 3, an end elevation on an enlarged scale;

Fig. 4, a detail plan on-an enlarged scale of tne boat hoisting and lowering winches and their operating gears, and the davits swinging winches and their operating gears;

F 5, an enlarged detail side elevation of the raising and lowering winches;

Fig. 6 an enlarged side elevation detail on the line 6-6 Fig.4, looking in the direction of the arrow;

Fig. 7, a similar view on the line 7-7, Fig. 4;

Fig. 8, an enlarged side view detail of the falls on the, Fig. 1, left hand end of the davits; V

Fig. 9, a detail plan enlarged of the Fig. 2 left hand end of the davit base and boom, the cross beam broken away; and

Fig. 10, aside elevation of the same end from the left, Fig. 1. l 7

Referring first to Figs. 1,2, my novel construction comprises bases 1, 2, each having side members 3, 4, spaced a oart and secured by flanges 5 to thedeck 6, the bases being a suitable distance apart as desired, to accommodate thesize of the boat used,

To avoid the inconvenience and danger which have always accompanied the use of the horizontally swinging davits, I have conceived the novel plan of using igs. 1,

Specification of Letters Patent.

Patented Dec. 27, i921.

1920. Serial No. 384,409.

2, vertically swinging davits 8 mounted on horizontal pivot bearings 9 in the bases 1, 2.

The davits are connected by a cross-bar 10. The swinging action of the oavits 8, F igs. 1, 2, 3, is immediately controlled, and their positions both inboard or normal, and when outboardor in use, determined by booms l1, pivoted to the davits near their upper ends and carrying, each at its; lower end, a pin or roll 12 adapted to slide in slots 13 in the opposite side members 3, 4, of the base.

The rolls 12 rest against the upper end of the slots when the davits are swung out 'i'or use, see dotted lines Fig. 3, and, same fi ure against the opposite ends ofthe slots normally or when the davits are not in use.

I, will now proceed to describe the davit operating means for launching the boat, which normally rests upon the checks 14 on deck. Secured to the bow 15 of the'boat 1130 2 4 5. is a cable 17. which asses through a block 18, over a fixed pulley 19 on the cross-bar 10, down beneath a pulley 20 slidable on a bar 21 in the standard 22, base 2, and standard 23, on the deck permit even winding of the cable thereon, the cable running therefrom about a winch 24 to which it is secured. -Whi'le the standards 22, 28, are here shown as single flat sheets of sheet steel, obviously they may be of any desired suitable configuration.

From the stern of the boat, Figs. 2, 4. 5, a cable-26 runs through a block 27 suspended likewise from the crossbar 10, thence lengthwise thereof over'the fixed pulley 19 and through the swinging block 28 down heneath a similar pulley29 on the bar 21 up and about the winch 30, with the winch 24,

on a common shaft 31 in the standards 22,23.

On the which 30, Figs. 4, 5, are the gear wheels 32 and 33. The former is adapted to and is shown as in mesh with a pinion34 on a shaft 35 mounted in the standards 22,

23, and extended through the walls- 3. 4, of

the base 2, and the gear 33 has a pawl 36 on On the the standard 23 to act thereon. which 30 is a drum 38 about which extends a brake band 39, one end of the same, Figs. 5, 6, being secured to a pin 40 extended laterally from the standard 23, while its opposite endis pivoted to an arm 41 on the bar .21. On the Fig. 5 right hand end ofthe I bar 21 is a brake lever 42 also see Fig. 3,

for operating this brake band with a; pawl or dog 43 91 its ripp end p d to enare V gage slots 44 in a plate or bar e on the standarchthe dog being operated by a handle 46. By rotation of the shaft35 and winches 24, 30, through the cranks 37 obviously the cables 17, 26, will be wound thereon or unwound therefrom, and the boat raised or lowered.

For swinging the davits out fromthe deck preparatory to raising or lowering the boat '1 have invented the followingnovel means.

Besides the winches 2.4 and30,'Fig.- 41, are

the two smaller davi t swinging winches 48', 49 also'on a common shaft 50 mounted in the standards .22, On the shaft is a gear .arcl 23.

down upon the collar 52, a cut away portion- 54, of the pawl, Fig. 6, fitting over the things on the collar and preventing it andthe shaft from moving longitudinally.

On the-outerand, Fig. 1, lower endof the shaft ,50 is alratchetwheel 55and a pawl 56 on'hthe standard 23 engages the same, On this shaft also, Fig. 3, beside the ratchet,

' isa drum 57, about which is a brake band in the standard23, while the opposite end" i is pivoted to a 'foot brake lever 60, Fig. '6,

p the base and then to and over a pulley 64 at the bottom and on the inner sideof the wall 4 of base 1 thence forwardbetween the- 58, one end of which is secured to a pin 59 pivoted also to the standard 23.

To the winch earigs. 1,4:, is fastened a cable 62. which runs through a block 63 on walls 3, it, and, Fig. 10, around a pulley 65 mounted in the members .3, 4, right hand end .Fig. 2 and thence rearwardly to the.

lower end of the boom 11. A turnbuckle 6.8 mey ein rodueed int the cable 2 i si ed for adjustment of the same .to meet necessary requirements.

From the winch 49, Fig. 4, runs a cable 76 fast thereon over a pulley 71 on the Fig.

1 left hand wall of thebase 2, and from thence it runsFig; forwardly between the walls 3, 4:, over a pulley 72 and then to the lower end of the boom 11.:

It will be clear that by winding up the cables62, upon the winches 48, e9, the

cables will draw the lower ends o-fthe booms 11" outwardly, and upwardly, Figs. 3,7, to I l the left, the rolls 12 slidi I g in the slots 13 in thefside members 3,

1 a V i as far as the boom ends need be raised. Qn eside wa l; itres igsa each case, is a ratchet bar 73 to beengaged by a pawl 74 on the end of the boom 11 and like it when it is in raised or outward'position, so that rolling of the vessel may not act to cause the boom to slide inwardly and downwardly and get out of control of the operator.

In each base Fig. and just below the slot .13 ,is a stop. in the form of an adjustable pulley 75 inablock'i' 6 slidable in a slot 77 in each side member 3, a, movement of the block and pulley being controlled (by a wheel 78 on a shaft 79 threaded into the upper, Fig.

7, left hand end of the block, thewheel being positioned in a slot 80 inthe wall member and thus kept from traveling.

Obviously the positions of the pulleys 75.

in the slots 77 will determine the extent to which the booms 11 can be moved upward in the slots 1.3 before the chains 70, 62 contact therewith, and normally the pulleys 7 5 are so positioned that they will permit the booms 11 .to' be'raised by the cables 62, 70,

sufliciently to swing the 8 outward just beyond the perpendicular. Then when the davits are in outermost position the boat will drop by gravity clear of theships deck when the cables 17,26 are released from the winches 24- 30,"by the brake 4-2. If however,

the sea; is rough and the ship rolling badly andthere is necessity for moreleeway to prevent the boat from striking the vesselwhen the boat is lowered, the wheels 78 areturned and theblocks 76, and pulleys 75 raised to permit the boom. ends to be raised higher and. thus swing the davits fartherout and away from the ship.

follows:

1 The boat V chocks 14 with the cables 17, 26, secur ed Themethod offusing my'invention is as Fig. 2,"normally rests upon the thereto and runningthrough theblocks or falls as describech i The davits 8 and boonisll will occu y the positions shown in, Figs. 2,3, 7, t e

pawls 7 1i,- Figs. 1,9, loweredto engage. the ratchet barns.

The shaft 35 is first withdraw'mFig. .45, 2'. 63., toward the bottom of the ft the pinion; 34' will engage the, Eiava swinging winch gear 51 and lockedin that positionb y dropping th pawr'ss inposition to engage the collar v 52; "Pawl 56 will 56 also be inengagement with gear 55 -to lock thewinches securely against backward motion as the cables are wound uponthem.

One or both cranks 37 asfmay be necessary are turned {to the right Fig. i, to wind the cables upon; thewinches 48, .49. and thus move the da itsSand booms 11, to the left until the lower ends, of the booms are nearly vertically over the. pulleys 75 over which the cables 62,}70 run which is usually ure, so that I engages a pulley 7 5 and prevents further raising of the booms which during the previous movement have raised the boat from its chocks. The davits 8 will now be positioned outboard, dotted lines, 3, just beyond the perpendicular. From this point, the pawl 56 being now raised to permit unwinding of the cables 62, 70, the weight of the boat will swing davits to their outermost position, see Fig. 7, dotted lines and Fig. 1, their swinging movement being controlled as to speed by the foot brake 60, either with or without the use of the cranks 37, the cables 62, 70, unwinding in the meantime until the rolls 12 engage the upper ends of the slots 13, Fig. 3.

As already stated, the lateral position of the roll 7 5 relative to the pulley 72 may be adjusted at will to suit any particular case by turning the'wheel 78 which moves the block 76 and the roll 75 up or down in slot 7'7, and thus determines how far the lower ends of the booms 11 may be raised by the cables 70, 62, attached thereto and running over the pulleys 72 and of course how far outboard the upper ends of the davits 8 may extend.

After raising the pawl 36 to free the ratchet 33 and winches 24, 30, the boat may be lowered to a level with the deck (ito re- 7 ceive passengers ifdesired, and next lowered into the water and by means of the hand brake 42 these winches are controlled and permitted to rotate in the rearward or Fig. 4, left hand direction slowly unwinding the cables 17, 26, and allowing the boat to descend gradually into the water.

To raise the boat from thewater the pawl 36 is dropped into engagement with the gear 33, shaft 35 is slid inwardly until pinion 34 meshes with gear 32 and locked there by the pawl 56. Then byturning the cranks 37 to the right, Fig. 4, the cables 17, 26, are wound upon the winches 24, 30, until the boat is raised to the proper height.

Then the shaft 35 is again slid longitudinally outward, Fig. 4 downward, until pinion 34 meshes with gear 51. The cranks 37 are turned to the left, Fig. 4, winding up cables 62, 70, on the winches 48, 49, and swinging the davits 8 and booms 11 inboard until each roll 12 is positioned substantially over a pulley 7 5 when the pawl 56 is raised to free the ratchet 55 and permit unwinding of the cables 62, 70, and the davits and boat are swung inboard by the sailors, the movement of the booms being controlled by the foot brake 6Ov Thereafter the boat may be lowered into the chocks by the winches 24, 30, or by a little experience the boat may be raised from the water to such a height that when the davits are swung inboard th boat willslide naturallyinto the chocks.

By my improved construction the boat may always be swung outboard on an even keel'under such control that the men at either davit in control of the cables, are not in danger of precipitating one end of the boat into the water ahead of the other end.

Both ends of the boat will drop simultrolling means including aboom and a winch therefor, locking means onthe base for locking the boom' against backward travel, a movable stop on the base for determining the extent of outward travel of the boom, boat lowering means including a winch, and common operating means for the winches.

2. Boat launching apparatus comprising a base, a davit movable thereon, davit controlling means including a boom slidable on the base and normally at rest at the inner end of said base, a which for moving said boom, a movablestop for the boom, boat lowering means including a winch, and com" mon operative means located with said winches between the boom and davit on the base.

3. Boat launching apparatus comprising a base, a davit movable thereon,idavi t-controlling means including a boom slidable a -n gularly upward on the base, a winch therefor beneath the path of travel of the lower boorn'end, boat lowering means including a winch,and common operative means longitudinally adjustable to operate both winches.

4. Boat launching apparatus comprising a base, a davit movable thereon, a boom connected with the davit and having one end slidable in said base, a stop member for the boom below the path of travel of the lower boom end to determine adjustably the distance of travel ofthe boom, a winch for moving the boom and mounted in the base, a winch for moving the davit, gears on tln winches, an operating shaft on the base hav ing a pinion, said shaft movable in its bearings to cause it to engage either winch gear, and brakes for the winches.

' 5. Ships davits comprising vertically swinging davit members, bases therefor,

booms for the davits having slidable connections with the bases, a pin on each boom end seated in a slot, an adjustable pulley on the base, and a cable thereon connected with the boom end to swing the davits outboard and inboard.

6. Ships davits comprising vertically llii ble to swing the davits outboard and in board; 7. Ships .davits comprising vertically swin in davit members a winch for hoistg r ing a boat thereon, bases for the davits, booms for the davits having slidable connections with t'hebases comprising a slot in each base, a pin in each boom and seated in saidjslot, an adjustable pulley on the base, a cable thereon connected with the boom 3 end, anda winch for winding the, cable to swing the davits out-board and inboard.

8'. Boat launching apparatus comprising a plurality of bases, a davitxand boom movableon each base, stop members therefor'adjustable on the bases to' determine the length of, travel of the booms and davits and a winch on one base formoving the booms, a winch for moving the-clavlts, gears on the w1nches,an operating shaft onone base having a pinion, said shaft being movable on the base to cause it to engage either winch gear, and brakes for the wlnches;

i 9, Boat launching apparatus for launch ling and raising a boat, on an .even keel com- U prising bases, davits'movable thereon, booms forthe davitsconnected therewith and also movable on the bases, adjustable stops on the bases to determine, the extent of travel of thebooms, a boom winch, cables for moving the booms by the winch to swing the davits outward and raise the boat on an even keel from the chocks,";a boat winch, and cables thereon for lowering the boat on aneven keel. J w a V 10. Boat launching apparatus comprising ing a movable shaft for simultaneously" throwing the boom operating winch out of and the boatlowering winch into operation.

11. Boat launching apparatus comprising bases 1, 2 with slots 13 therein, vertically swinging davits 8 mounted on the bases and connected together, booms 111 pivoted to the davits, with pins 12 at their inner ends 7 and; adapted to'slide in the slots 13, a ratchet bar 73 on each base, a pawl 74 on each boom to engage the same, a slot 77 in each base with a block 76 and pulley 75 thereon slidable therein. a shaft 79 with wheel 7 8 threadedfto said block, slots in the bases 1, 2 with the wheels '78 positioned therein; the bar21 in the base'with pulleys 20, 29; winches 24, 30 on the shaft 31 in the standards 22,23 on the base 1, gears 32, 33 on the winch 30, clavit winches 48, 49 on the shaft 50 in said standards 22, 23 gear51 on the winch 49, a shaft with crank 37 inthe base 1 with pinion 34 thereon adapted to mesh with either gears 51 or 32; a flange collar'52 on pawl 53 adapted to rest the shaft 35 and thereon to hold the" gear 34 in mesh with either gear 32 01 51, falls for connecting the boat'with two of .saidwiiiches and falls for connecting the booms with two of said winches whereby the davits may be raised to a substantially vertical position raising the boat from the chocks,

and the boat may be lowered on an even keel to the water, and

brakes for controlling the action of the winches. a a V In testimony whereof I have signed my name to this specification 7 CHARLES B ossoN. 

